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Heart Rot and Root Rot in Tropical Acacia Plantations

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Heart Rot and Root Rot in Tropical Acacia Plantations Heart rot and root rot in tropical Acacia plantations Proceedings of a workshop held in Yogyakarta, Indonesia, 7–9 February 2006 Editors: Karina Potter, Anto Rimbawanto and Chris Beadle Australian Centre for International Agricultural Research Canberra 2006 The Australian Centre for International Agricultural Research (ACIAR) was established in June 1982 by an Act of the Australian Parliament. Its mandate is to help identify agricultural problems in developing countries and to commission collaborative research between Australian and developing country researchers in fields where Australia has a special research competence. Where trade names are used this constitutes neither endorsement of nor discrimination against any product by the Centre. ACIAR PROCEEDINGS SERIES This series of publications includes the full proceedings of research workshops or symposia organised or supported by ACIAR. Numbers in this series are distributed internationally to selected individuals and scientific institutions. © Australian Centre for International Agricultural Research, GPO Box 1571, Canberra, ACT 2601 Potter, K., Rimbawanto, A. and Beadle, C., ed., 2006. Heart rot and root rot in tropical Acacia plantations. Proceedings of a workshop held in Yogyakarta, Indonesia, 7–9 February 2006. Canberra, ACIAR Proceedings No. 124, 92p. ISBN 1 86320 507 1 print ISBN 1 86320 510 1 online Cover design: Design One Solutions Technical editing and desktop operations: Clarus Design Pty Ltd Printing: Elect Printing From: Potter, K., Rimbawanto, A. and Beadle, C., ed., 2006. Heart rot and root rot in tropical Acacia plantations. Proceedings of a workshop held in Yogyakarta, Indonesia, 7–9 February 2006. Canberra, ACIAR Proceedings No. 124. Foreword Fast-growing hardwood plantations are increasingly important to the economies of many countries around the Pacific rim, including Australia, Indonesia and the Philippines. While the initial emphasis in most countries has been on the market for fibre, pulp and paper, there is now increasing interest in using the species for the production of solid-wood products. Indonesia has been at the forefront of the domestication of Australian acacias, especially Acacia mangium, and there is now an impressive estate of over one million hectares of acacias in the country. This resource is progressively replacing natural forest as a source of fibre for Indonesia’s large paper-producing industry. Acacia mangium and a number of other acacias produce good-quality timbers which are also well suited to the production of furniture and other higher-value products. A factor limiting this application is the occurrence of fungal heart rot in the central core of the stem at an early age. This defect does not seriously affect pulping properties if the crop is harvested early but it does significantly reduce the recovery of sawn wood and veneer from older logs grown for higher-value products. Identification of the factors causing the condition, and potential management strategies, have been the subjects of a major ACIAR project, ‘Heart rots in plantation hardwoods in Indonesia and southeast Australia’. Indonesian acacia plantations are also potentially threatened by root rot, another fungal disease. Root-rot diseases of A. mangium can cause crown dieback, reduced growth and tree death. In some areas, over 25 per cent of trees are affected. If not managed, this problem could seriously threaten Indonesia’s acacia plantation industry. ACIAR is now initiating a project to investigate it. A workshop with participants from Indonesia’s Forest Research and Development Agency, forestry companies and local universities, and research agencies in Australia and New Zealand, was conducted in Yogyakarta in February 2006 to review the results of the heart-rot project and define a strategy for root-rot research. These workshop proceedings provide valuable guidance on minimising the impacts of these two serious diseases in hardwood plantations. Peter Core Director Australian Centre for International Agricultural Research 3 From: Potter, K., Rimbawanto, A. and Beadle, C., ed., 2006. Heart rot and root rot in tropical Acacia plantations. Proceedings of a workshop held in Yogyakarta, Indonesia, 7–9 February 2006. Canberra, ACIAR Proceedings No. 124. Contents Foreword 3 Contents 5 Preface 7 Summary 8 Acacia mangium — a historical perspective on its cultivation Hardjono Arisman and Eko B. Hardiyanto 11 Hardwood plantation development and threats to its sustainability in Indonesia G.D. Golani 16 Heart rots in plantation hardwoods: the background to this ACIAR project Anto Rimbawanto 22 Heart rot and root rot in Acacia mangium: identification and assessment Caroline L. Mohammed, Karen M. Barry and Ragil S.B. Irianto 26 The mycology of the Basidiomycetes Ian A. Hood 34 The use of DNA techniques to identify fungi Morag Glen 46 Molecular identification of organisms associated with root and heart rot in Acacia mangium Morag Glen, Karina Potter and Purnamila Sulistyawati 55 Root rot in tree species other than Acacia A. Mohd Farid, S.S. Lee, Z. Maziah, H. Rosli and M. Norwati 60 The biological control of Ganoderma root rot by Trichoderma S.M. Widyastuti 67 Minimising disease incidence in Acacia in the nursery74 Budi Tjahjono 75 Developing a strategy for pruning and thinning Acacia mangium to increase wood value Chris Beadle 79 Options for solid-wood products from Acacia mangium plantations Eko B. Hardiyanto 87 5 From: Potter, K., Rimbawanto, A. and Beadle, C., ed., 2006. Heart rot and root rot in tropical Acacia plantations. Proceedings of a workshop held in Yogyakarta, Indonesia, 7–9 February 2006. Canberra, ACIAR Proceedings No. 124. Preface About 1000 species of Acacia are native to Australia and neighbouring Indonesia, Papua New Guinea (PNG) and some Pacific island nations. Several are now used in commercial plantations in Southeast Asia and are the basis of substantial plantation- based industries. Within this region, plantations of tropical acacias have been established in China, Indonesia, Malaysia, Papua New Guinea, the Philippines, Thailand, Vietnam, and on Melville Island in Australia. The total area planted is now approaching 2 million ha and the largest of these estates (about 1.2 million ha) is located in Indonesia where the major species planted is Acacia mangium Willd. The majority of acacia plantations are used as feedstock for kraft pulp mills. However, substantial quantities of wood are now finding their way into markets based on high- value solid timber. Heart rot is caused by white-rot fungi which preferentially remove lignin. They are thought to enter trees through injuries and branch stubs. In Indonesia, this disease is a threat to solid-wood production and prevents the management of plantations for solid- wood values on some sites. Root rot is caused by basidiomycete fungi that can survive saprophytically on dead woody material or debris. The fungi attack the conducting tissues of living trees, rapidly causing tree death. The saprophytic nature of the fungi, together with the short rotations used by the pulpwood industry (6–7 years), have led to a rapid build-up of inoculum at some sites in Indonesia. Acacia mangium is particularly susceptible to root-rot disease on mineral soils in Sumatra and Kalimantan, where it is grown extensively. This volume brings together the current state of knowledge about these diseases. The more recent advances in knowledge have been made possible by funding through ACIAR project FST/2000/123 that supported a substantial body of research on heart rot. A project extension further encouraged the development of a knowledge base on root rot in Indonesia that will now be carried forward in a new ACIAR project, FST/2003/048. The research has been undertaken to date in close cooperation with the Indonesian Ministry of Forestry through its Centre of Plantation Forestry and Development, Gadjah Mada University’s Faculty of Forestry and PT. Musi Hutan Persada. The contributions of other Indonesian-based companies and the Forest Research Institute of Malaysia (FRIM) to the workshop ‘Heart rot and root rot in tropical Acacia plantations: a synthesis of research progress’ held in Yogyakarta on 7–9 February 2006, from which these proceedings are drawn, ensured a comprehensive coverage of the available information. The cooperating partners in Australia were the University of Tasmania and Ensis (the joint forces of CSIRO and Scion). The interest and expertise of the chapter authors is gratefully acknowledged. 7 From: Potter, K., Rimbawanto, A. and Beadle, C., ed., 2006. Heart rot and root rot in tropical Acacia plantations. Proceedings of a workshop held in Yogyakarta, Indonesia, 7–9 February 2006. Canberra, ACIAR Proceedings No. 124. Summary The total area planted to tropical acacias is now assessment of two trials within different commercial approaching 2 million ha. The largest of these estates growing areas in Indonesia (Riau and South Sumatra) (about 1.2 million ha) is in Indonesia where the major showed that provenance could influence the inci- species planted is Acacia mangium Willd. Acacia dence of heart rot. The basis for this observation mangium is generally grown as an exotic. It was first remains unclear, as heart-rot incidence was not cor- introduced into Malaysia in 1966 and into Indonesia related with the content of polyphenolic wood extrac- in 1979 where it was used in South Sumatra as a fire tives which are a known antifungal defence. break, for land rehabilitation and for reforestation of Root-rot diseases of A. mangium are associated alang-alang grassland. Its excellent adaptability to with crown dieback, reduced growth and tree death. degraded sites, rapid growth and wood properties When first detected, infected trees or disease foci quickly led to its commercial exploitation. In Indo- tend to be randomly distributed but then enlarge and nesia, pulpwood production from A. mangium plan- may aggregate. The rate of disease progress appears tations is currently more than 9 million m3/year, to be positively correlated with current levels of root while the potential for solid-wood production is rot. Accurate surveys to investigate spread are around 165,000 m3/year.
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